# XVal operators

### Truthyness and falsyness

| Falsey              | Truthy             |
| ------------------- | ------------------ |
| `false`             | `true`             |
| `0`                 | All other numbers  |
| `""` *empty-string* | All other strings  |
| `null`              | `()` *unit-symbol* |
|                     | All list values    |
|                     | All object values  |

### **If-then-else operator**

```
a ? b : c   // This stands for “if a then b else c”
```

### **Short circuit operators**

The `||` and `&&` operators are **truthy** based value short circuit operators.

`a && b` returns `a` if a is **falsey**, or `b` if a is **truthy**.

`a || b` returns `a` if a is **truthy**, or `b` if a is **falsy**.  This can be used for boolean logic (price < 100 && quantity < 3), for value selection based on conditions (price < 100 && ‘cheap’ || ‘expensive’), or for value coalescing (nickname || fullname).